Gauging apparatus for controlling a grinding operation



Jan. 25, 1949. H. MICHELSEN ET AL 2,460,232

GAUGING APPARATUS FOR CONTROLLING A GRINDING OPERATION Filed Aug. 16. 1944 ,4 Shleets-Sheet 1 Jan. 25, 1949. H. MICHELSEN EI'AL 2,460,232

GAUGING APPARATUS FOR CONTROLLING A GRINDING OPERATION Filed Aug. 16, 1944 4 Sheets-Sheet 2 //vvE/v7'o/as: HENRY MICHEL-6 EN,

MERTON E. 125/0,

- I Me 736/8 A 7'O/QNE).

Jan. 25, 1949. H. MICHELSEN ET AL 2,460,232

GAUGING APPARATUS FOR CONTROLLING A GRINDING OPERATION Filed Aug. 16, 1944 4 Sheets-Sheet 3 INVEN TORS J HfNRYM/CHELSEN, 4, V MERTON E. 125/0,

. /g d m BY THE/1Q ATTORNEY Jan. 25, NHC ELS N ET AL 2,460,232

GAUGING APPARATUS FOR CONTROLLING A GRINDING OPERATION Filed Aug. 16, 1944 4 Sheets-Sheet 4 21a hvvs/v TOBS:

HE/VR Y MICHELSEN,

MERTON E. REID THE/e A rroe NE X Patented Jan. :5, 949

UNITED STATES PATENT OFFICE GAUGING APPARATUS; FOR CONTROLLING A GRINDING OPERATION Henry Michelsen and Merton E. Reid, BristoL. Conn., assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application August 16, 1944, Serial No. 549,666

21 Claims. .(Cl. 51165) This invention relates to gauging apparatus ll'ld particularly to gauging apparatus which con- ;rols a sizing operation on a work piece.

An object of the invention is to provide an improved gauging apparatus for controlling the grinding of a work piece to size.

Another object is to provide an improved gauging apparatus for controlling a grinding operation on an article in response to the finished size of another article.

Another object is to provide an improved gauging mechanism for controlling a grinding operation on one of a pair of articles remotely positioned from each other and intended for mating relation and wherein the finished size of one of these articles controls the size to which the other article is ground.

To these ends and also to improve generally upon devices of the character indicated, the invention consists in the various matters hereinafter described and claimed In its broader aspects, the invention is not necessarily limited to the specific constructions selected for illustrative purposes in the accompanying drawings wherein;

Figure 1 is a diagrammatic view including a showing of the electrical circuits and illustrating the operation of the invention;

Figure 2 is a fragmentary side elevation of the remote control gauging mechanism;

Figure 3 is a view in cross section taken substantially along the line 33 of Figure 2;

Figure 4 is a vertical section taken substantially along the line 4-4 of Figure 2;

Figure 5 is a partially broken away side elevation of the work piece gauging head;

Figure 6 is a front elevation of the regulating mechanism for the gauging head;

Figure 7 is a cross section through the regulating mechanism and taken along the line 1-1 of Figure 6; 1

Figures 8, 9 and relate to a modification;

Figure 8 shows the work piece gauging head engaging one of the raceways on a race ring for a double row antifriction bearing;

- Figure 9 is a partially broken away side elevation of a remote control gauging mechanism for measuring the raceways of a double row race ring; and

Figure 10 is a fragmentary front elevation of the remote control gauging mechanism of Figure 9.

This invention, which controls a machining operation for reducing an article to a size determined by the size of another article, is especially adapted for controlling the grinding to size of an antifriction bearing race ring by mechanism which measures the finished size of another race ring. HeretOfore, it has been common practice to employ oscillating grinding machines for separately grinding the mating inner and outer raceway grooves in ball bearing race rings to predetermined sizes within as close limits of accuracy as the grinding machines were capable. Grinding errors may be present in one or in both raceways that are to be used in mating; relation, and frequently these errors may be cumulative. Attempts to reduce these cumulative errors have been made by gauging and matchin the raceway sizes of the inner and outer race rings for mating relation so that one error would tend to ofiset or minimize the other error. In some instances, these errors have also been reduced by selecting the size of the balls which roll within these mating raceways. However, the additional operations of carefully gauging and sorting race rings and bearing balls into matching relation seriously retards production and frequently results in bearings with balls that do not correctly fit their raceways. In accordance with this invention, either the outer or the inner race rings are initially ground in a suitably simple manner and as closely as possible to the desired raceway size. Thereafter, each of these ground race rings, irrespective of its raceway size, is employed in conjunction with the gauging mechanism to control the grinding to a corresponding size of the raceway in a race ring to be used therewith in mating relation. By way of illustration, this invention is described by reference to the grinding of the raceway of a ball bearing inner race ring under control of gauging mechanism which precisely measures the finished raceway size of the outer race ring that is to be assembled in mating relation with this inner ring as a part of the final bearing.

Generally considered, an outer race ring as M, has a finished raceway N measured by a remotecontrol gauging mechanism l0 having an indicator hand I2 movable over a dial to indicate the raceway size. An inner race ring, as R, provided with a raceway S to be ground by a grinding wheel I3 to a size for assembly in mating relation through standard sized bearing balls with the raceway N, is rotatably mounted in the usual manner for grinding, as on an oscillating grinding machine. The details of this mounting and of, the grinding machine are not herein illustrated since they can be variously constituted and are well understood in the art. During grinding, a vertically movable stem H in a gauging head synchronous motors "and 24, respectively se cured on the gauging mechanism II and on the. gauging head I I, are simultaneously started from predetermined individually controlled startin! positions after the indicator hand I! has reached a measuring position. The motor 24 advances the contactor I! towards the contactors I1 and it until a contactor II, moved by the motor 22, engages the indicator hand I! to close a relay circuit which stops both motors. when the raceway B is nearlyv down to final size, the advancing contactor ll engages the prelocated contactor I! to electrically control a change in grinding feed from a coarse feed to a line feed, and when the raceway is completely ground except for sparking out, the contactor ll engages the contactor H to electrically control the stopping of the grinding feed. At the completion of the grinding feed, the motors 22 and are reversed to return the contactors and II to their predetermined starting positions.

In the illustrated embodiment, the remote control gauging mechanism II, which may be suitably supported remotely from the gauging head l6, has a body portion 3| and a housing 3| mounted in adjacently fixed relation on a suitable support. A horizontally disposed sleeve fastened in the body portion 80, has an end flange 34 to which is secured a dished ball retainer 35 that has a cylindrical wall provided with a series of circumferentially spaced apertures through .which balls 36 project for gauging contact with the raceway N. These balls preferably have the same size as and are spaced correspondingly to the balls which will later be assembled with this race ring M in a ball bearing, and the apertures which loosely receive these balls 8Q are preferably restricted sufliciently at their outer ends to prevent the balls from falling out of the ball retainer when there is no race ring being gauged. A plunger 31, journalled'in the sleeve 33 for longitudinal and rotatable movement, has at one end a frusto-conical ball-engaging head 38, and has at its other end a stem 40 that freely extends into the housing 3|. A coiled spring, projecting from a recessed end of the plunger 31 and compressed against the ball retainer 35, yieldably urges the plunger towards the housing'3l and into a gauging position which is determined by that axial position of the conical head 38 which 'locates the balls 36 seated against the raceway N. To assure that these balls will locate in correctly seated raceway engagement, the race ,ring M may be turned manually causing the balls to roll on the raceway N and on the conical head II. A hand lever 42, mounted on a shaft carried by the body portion 30, operates a cam against a roller on the lower end of a pivoted lever 43 to swing the upper end of this lever against the plunger 31 and shift the conical head 38 towards the ball retainer 35 so that the balls 36 may move radially inwardly of the ball retainer to allow the race ring M to be moved over the balls into and out of gauging positions. ,A spring urges the lever 43 away from plunger engagement, and the hand lever 42 may be swung to rest against a supporting stud 44 to hold the plunger 31 in non-gauging position.

A horizontally movable block 41, supported by a pair of reed springs 4| that depend from a bracket "in the housing ll, has threaded into one end an adiustingscrew I! fastened in adiusted position to be engaged by thestem 44. A depending arm II is secured to the other end of this block. A coiled spring l4,compressed between the arm I3 and the housing, co-operates with the reed springs 44 to urge the block 41 and the depending arm towards the left to a gauging position determined by the engagement of the screw '2 with the stem 44; A screw 45, secured in adjusted position in the lower end of the arm II, is'engaged by a head ll on a horizontally disposed spring pressed plunger longitudinally slidable in a bracket I! that is fastened in horizontally adjusted position on a housing arm it by a screw 04. A cap 62, insulated from and secured to the plunger 51, is engaged by the spring pressed stem of a dial indicator '8 visible through a housing window 64. This indicator has a graduated dial I over which the indicator hand I! moves to show the variation from standard size of the raceway N. A screw clamps the dial indi' cator in position on the arm II and insulating washers i0 prevent grounded electrical connection between the dial indicator and the arm 58. The screw 52 is preferably so adjusted that the lower endslof the reed springs 44 are deflected slightly towards the arm it during a gauging operation, and the screw 55 is adjusted to position the indicator hand II at a zero index when the balls are in gauging position against a raceway of standard size. In the present instance, the dial 4! is shown graduated at each side of the zero index so that the indicator hand i2 will indicate the extent of oversize or undersize of the diameter of the raceway N in ten thousandths of aninch. For convenience, the

. dial 8! is also marked with an arcuate zone ll that is located beyond the range of acceptable raceway diameter. Hence, whenever the operator sees the indicator hand I! at a measuring position within this zone 61, he discards the race ring being gauged since its raceway lies outside of an acceptable size range.

The reversible slow-speed synchronous motor 22 is fastened to the housing 3| and has a reduction gearing provided with a shaft 61 coaxial of the indicator hand l2. An arm 10, overlying the dial indicator 63 is secured at its inner end to a collar 12 of insulating material fastened in ad- Justed position on the shaft 68 as by a set screw, and the other end of this arm 10 carries the contactor 26 which is swung into and out of engagement with the indicator hand and in a path ad- Jacent to the dial graduations. After the indicator hand has reached a measuring position, the operator presses a starting button 13 which energizes circuits to be later described and simultaneously starts both motors 22 and 24 operating in synchronism, and these motors advance the contactors Z6 and I9 from their initial preset positions shown in Figures 2 and 5. The contactor 26 is moved counterclockwise as viewed in Figure 2 until it engages the indicator hand [2 and closes electrical circuits which cause both motors to simultaneously stop with the contactor I9 located in a position determined by the measuring position of the indicator hand I2. At the end of the grinding wheel feed these motors are reversed to return the contactors I! and 2! to their initial starting positions. During' this motor reversal, the contactor 26 swings clockwise away from the indicator hand I! until a pin 14, projecting from a flange on a collar ll adjustably fastened to the aaedoaa s shaft 88, as by a setscr'ew, shifts a bell crank to operate a switch 11 which stops the motor 22. This initial preset position to which the contactor 28 is returned may be preadjusted by rotatably positioning the collars 12 and 15 relative to each other.

The indicator hand I2 cannot be swung intoelectrical contact with the contactor 28 while this contactor is located at its preset starting position of Figure 2' because movement of the/indicator stem is limited in both directions. The cap 82 will engage the adjusted bracket and limit outward movement of the stem, and this stem cannot be urged inwardly by the plunger 51 beyond a point determined by the engagement of a stud 8| with'the lower end of an adjusting screw in the bracket 58.

The gauging head I8 has a casing 85 that is supported in a fixed position by a bracket 88, and

the stem I4 is vertically slidable in a bushing 81 in the bottom of the casing .and in a bushing 88 having a lower reduced portion fitted within a boss 9I on top of the casing. A wear-resistant gauging point 92, on the lower end of the stem I4, is arranged to ride upon the raceway S for vertically positioning the stem I4 during grinding,

and a coiled spring 93, interposed between the top of the casing 85 and an adjusting nut on. this stem, urges the stem downwardly into a gauging position. A collar 94, journalled on the enlarged upper end of the bushing 88 and seated on top of the boss 9|, has a generally spiral slot 95 open at its lower end and slidably engaging a fixed pin 98 that laterally projects from the enlarged upper end of the non-rotatable bushing 88. A washer 91, fitted over the upper end of the bushing 88, is normally loosely interposed between the top of the collar 94 and the underside of a-cap member 98 that is fastened by a nut against a shoulder on the upper end of the stem I4. A hand lever I88, threaded into the collar 94, laterally extends through a slot MI in the cap member 98. When the hand lever I88 is turned to the position of Figure 5 where the pin 98 is at the top of the spiral slot 95, the stem I4 is lowered into supported relation on the raceway S, and there is sufficient clearance between the cap member 98 and the washer 91 so that the stem I4 is free to move downwardly and remain in raceway engagement during the grinding of this raceway to size. When the hand lever I88 is swung in an opposite direction, the collar 94 moves upwardly on the pin-98 and acts through the washer 91 to .lift the cap member 98 causing the stem I4 to be lifted out of gauging position so that race rings B may be mounted in and demounted from grinding position. If desired, the hand lever I88 may be turned sufficiently to remove the pin 98 from the bottom of the slot with the bottom of the collar 94 resting on this pin to hold the stem I4 in raised position.

A block I82, fastened to a lower portion of the casing 85, holds an end of each of a pair of spaced horizontally extending thin reed springs I83 whose opposite ends cooperatively support a block I84 for vertical floating movement. A block I85, secured to and laterally projecting from the stem I4, has a hardened contact point on its lower end engaged by a laterally projecting arm I88 on the floating block I84 which is urged upwardly by a coiled spring I81 causing this floating block I84 to take a vertical position corresponding to the vertical position of the stem I4. A pair of upwardly extending fiat springs I I8, whose spaced lower ends are secured respectively to the upper ends of the blocks I82 and I84, are spaced'at their upper ends by a plate, and an upwardly extending the plate therebetween. A spring finger I I4, provided with the contactor I1 and secured at its lower end to the amplifying finger III, tends to spring outwardly from the amplifying finger to a position determined by the engagement of a depending lug II5 on the arcuate upper end of the spring finger 4 against the finger III to initially position the contactor I1 at a predetermined spaced distance from the contactor l8 which is adjustably threaded through the upper end of the amplifying finger III. A spring finger I'I6, secured at its lower end to an insulating block on the casing 85, carries the contactor l9 at its upper end and urges this contactor l9 away from the contactors I1 and I8 to a position determined by the engagement of the upper end of the spring finger II8 against the rounded end of a stud I I8 of insulating material extending into the casing 85 and mounted on the inner end of a horizontal adjusting rod H9.

The downward movement of the stem I4 and of the floating block I84, in response to a reduction in diameter of the raceway 8, produces a corresponding downward movement of the spring II8 secured to the floating block I84 while the fixed block I82 prevents a bodily downward movement of its spring H8. The relative movement of these springs H8 causes a greatly amplified swinging movement of the amplifying finger III towards the contactor I9 so that the contactor I1 will make circuit with the contactor I9 and cause the initial .rough grinding feed to change to a finish grinding feed when the raceway S has been reduced to a size dependent on the preset position of the contactor I9. Thereafter, further reduction of the raceway S causes the springs II8 to swing the contactor I8 into engagement with the contactor I1 to close an electrical circuit which causes a termination of the finish grinding feed when the raceway S is further reduced to size that is dependent upon the gauged size of the finished raceway N. The extent of finish grinding feed may be predetermined by adjusting the contactor I8 in the amplifying finger I'II towards and from the contactor I1. When the hand lever I88 is swung to lift the stem I4 out of raceway engagement, the upward movement of the fioating block I84 acts through the springs H8 and causes the amplifying lever III to swing away from the contactor I9 until it engages a stop screw I2| adjustably threaded in the casing 85.

The reversible slow speed synchronous motor 24, which is secured to a gear housing I22 fastened on the side of the casing 85, is provided with a reduction gearing having a driving shaft I23 that extends into the gear housing. A gear I25 fastened to a stub shaft I28 which is secured to the shaft I23 as by a set screw, meshes with a pinion I21 that is axially fixed and supported for rotation by-bearings I28 mounted in a counter-bore of the housing I22. A horizontal sleeve I38, threaded through and axially adjusted by the inion I'21, has a flanged portion |8I movable QABOJSII.

7 member ill. The rod II! is threaded in the sleeve I3. for longitudinal adjustment of the stud III relative to the sleeve I" under control of a graduated knob III that may be turned with reference to a fixed index finger I. A thumb nut I31, threaded on the rod I'll, secures this rod in adjusted position. The knob I" is preferably so calibrated that turning the knob to the extent of one graduation eii'ects a difierence of one ten thousandth of an inch in the diameter to which the raceway S is ground. A dial I on the gear I", graduated similarly to the dial .5 and visible through a housing window Ill, rotates with respect to a fixed index finger In on the housing to indicate the extent of adjusting movement imparted .to the stud III prior to each grinding operation and under control of the measuring position of the indicator hand I'2. To aid the operator in determining that the contactor I'9 is correctly positioned each time that a cup raceway Nis measured, the gear I25 is adJustably secured to the stub shaft I26 in such a position that the indicated readings on the dials I40 and 65 will be identical while the contactor 26 engages the indicator hand I2.

' At the end of the finsh grinding feed when the contactor I8 makes circuit with the contactor I'I, electrical mechanism to be later described reverses both motors 2.2 and 24. The motor 24 continues its reversed rotation until an arm I43, laterally projecting from the stub shaft I28 operates a bell crank I to open a normally closed switch to stop this motor and locate the contactor I9 at its initial starting position. Since the stopping positions for the reversed rotation of both motors are individually controlled by the switches respectively operated by these motors, the contactors I9 and 26 will be returned to their preadJusted starting positions after each grinding operation and there can be no occasion for accumulated error of contact 8 v A rotatable chuck on a grinding machine (not shown) reversibly receives the inner race ring W p to successively place each raceway '1' in grindsettings relative to each other. The electrical circuits, which also apply to the modification, will be described later.

Figures 8, 9 and 10 show another embodiment of this invention which operates in generally the same manner for controlling the grinding to size of both raceways on one of the race rings of a double row angular contact antifriction bearing under control of a gauging mechanism which responds to the sizes and to the axial spacing of both raceways on the other race ring. In the usual grinding of the companion race rings of a double row antifriction bearing, slight inaccuracies may occur in the diameters of all four raceways and slight inaccuracies may also occur in the spacings of both sets of raceways. These inaccuracies are frequently cumulative. Hence, it has been usual to gauge these race rings and sort them as to raceway spacing and as to raceway diameters so that these inaccuracies would tend to offset each other. Also, to

spacing of both angular contact raceways L on an' outer race ring K to be assembled with standard size balls and in mating relation with this race ring W. I

ing position, and the gauging head II is fixedly supported through the bracket ll so that the stem Il may be lowered into correct-engagement with the raceway T being ground. A forwardl open housing In, having a depending boss I demountably secured on a post I, has a fiat top portion on which is mounted a casing I'll. A dial indicator 1", firmly fastened to and electrically insulated from a casing bracket III, has a measuring pointer or indicator hand Ill movable over a graduated dial III that may be observedthrough a casing window I". A syn-' chronous motor I", corresponding to the motor 22 and mounted on the casing, swings an arm I coaxially of the pointer III to bring a contactor I 85 from its present starting position of Figure 10 into electrical contact with the pointer Ill to present the gauging position of the gauging head contactor I9 in the same manner as described with reference to the gauging mechanism III. The dial IOII, which may he graduated similarly to the dial '5, is marked with an arcuate zone I6I corresponding to. the zone 1 on the dial 6! for aiding the operator in determining when the raceway measurements of the race ring K lie outside of an acceptable range. At the end of each grinding operation, the motors I63 and 24 are shifted into reverse by the engagement of the contactor I 8 with the contactor II. The reversed rotation of the motor I'" continues until a pin, laterally projecting from a disc I adjustably secured to the motor shaft, acts through a bell crank to operate a switch I" which stops the motor when the contactor III is returned to its starting position.

The finished double row outer race ring K is demountably held within the housing I 52 in an axially vertical'position by two similar rows of spaced balls I88 that are respectively engageable with the upper and lower angular contact raceways L in this outer race ring and with corresponding angular contact raceways on a pair of spaced inner race rings I10 one of which is arranged for coaxial movement relative to the other. The balls I68 of each row, which are loosely mounted in peripherally spaced relation within a retainer I12, are preferably of the same size, number and spacing as the balls which will be used in the finished bearing between the race rings K and W. When the rows of balls I68 are correctly seated against both sets of raceways, the axial spacing of the inner race rings I" will be affected by the slight diilerences from standard size'and from standard spacing of the raceways L, and the pointer I58 will respond to this axial spacing to precisely measure the aggregate of these slight differences and determine the presetting of the contactor l9 so that both of the raceways T will be ground to a size which compensates for these slight variations from standard in the race ring K. After one of these raceways T is ground and the contactors I65 and I! have returned to their starting positions, the stem I4 is lifted from the ground raceway, the inner race ring W is reversed on the chuck and the other raceway T is ground in the same manner and to the same size while the race ring K remains in gauging position.

An upper supporting member I13 that locates against-a housing shoulder at the lower end of a vertical bore I'll through the top of the housing I82, is piloted in this bore and hose depending cylindrical portion over which the upper race ring I10 demountably fits. A flanged bushing I18, seated on top of the housing and piloted in the bore I18, has a lower internally threaded end in which is adjustably threaded the upper end of a vertical sleeve I11.that extends through an axial bore in the supporting member I18. A head on the lower end of the-sleeve I11 and received in a counterbore in the supporting member I18, holds a plate I80 in conically seated engagement against a bevelled lower edge of the upper race ring I10 to demountably clamp this upper race ring against an annular locating shoulder on a supporting member flange I82 and to also 'demountably hold the supporting member I18 against the housing shoulder. A vertical plunger I88, longitudinally slidable in the sleeve I11, has a rounded lower end projecting into a counterbore in the head on the sleeve I11, and has at its upper end a head I88 slidable in the bushing I18. An adjusting screw I88, threaded in and extending upwardly from the plunger head I88, has a rounded upper end engageable with aflat face on a boss depending from the short arm of an amplifying lever I88 which is pivotally supported intermediate of its ends by horizontally disposed cross j pins carried by a bracket I88 mounted in the casing I88. The screw I88 is secured in adjusted position by a lock nut I88 having a skirt that overlies the top of the bushing I18 to prevent the entrance of dirt between the plunger head I88 and the bushing. The dial indicator stem, which is springurged downwardly from the dial indicator in the usual manner, is engaged by a stud I82 electrically insulated from and projecting upwardly from the long armof the amplifying lever I88. A coiled spring I88 urges the amplifying lever clockwise towards the indicator stem and towards the screw I85. Adjustable stop screws I88 and I85 limit the amplifying lever movement to prevent swinging of the pointer I88 into electrical contact with the contactor I88 when this contactor is located at its starting position shown in Figure 10.

The lower race ring I10 is demountably fitted over the reduced cylindrical upper end of a lower supporting member I88 and held against an annular shoulder on a supporting member flange I81 by a clamping plate I88 that is clamped in conically seated engagement against a bevelled race ring face by a cap screw 200 threaded into the supporting member I88. The flat top face of the cap screw 200 vertically positions the plunger I83 causing the pointer I88 to locate at a measuring position during a gauging operation.

Screws 202, freely extending through the clamping plate I88, demountably secure the supporting member I98 on top of a ram 208 which is keyed a ainst rotation and is vertically slidable through the boss I53. A depending pilot on the supporting member I80 fits within a bore in the top of the ram to locate the supporting member I86 coaxial with the supporting member II3 so that the inner race rings I10 will be coaxial. The ram 203 has a vertical bore 208 extending upwardly from a counterbore in which a plug 205 is threaded and held in adjusted position by a locknut. and a reduced sleeve portion 208 of this pug extends upwardly into the bore 208. A bolt 2 1. provided with a head in the upper end of the bore 208, extends downwardly through and is threaded in the plug 205 for longitudinal adjustment. The bottom of the bolt has a wrenchreceiving shank and a locknut secures this bolt in adjusted position. A coiled spring 208 loosely surrounds the bolt between its head and a washer 208 slidable on the bolt.

A generally horizontal lever 2I8, pivotally supported at -its outer end by a bolt 2 in the housing, extends laterally through slots into the bore 208 and has a forked inner end which straddles the bolt 201 and has rounded upper and lower surfaces. that are respectively engageable with the washer 288 and with the top of the sleeve portion 288. A hand lever 2I2 acts through a housing-supported shaft to rotatably position a cam 2I8 against a roller 2I8 on the lever 2I0 for raising and lowering the forked lever end which acts through the bolt 281, ram 288 and associated parts to vertically shift the bottom race ring I18 into and out of ga in position. The hand lever may be swung in one direction to lower the ram to its bottom position so that the operator may easfly laterally move a race ring K between the race rings I10 to mount this race ring K upon and remove it from the bottom row of balls I88. The hand lever is swung in an opposite direction to rest against a stop pin 2I8 for locating the race ring K. ram and associated parts in gauging position.

The plug 208 is adjusted in the ram to locate the ram relative to the lever 2I0 dependent upon I the spacing of the raceways L. The bolt 201 is adjusted in the plug 208 to so regu ate the compression of the spring 208 during gauging that the balls I88 will correctly seat against the raceways under substantially identicalconditions during successive gauging operations and without causin injury or'distortion to the balls or raceways. The minute difference in spacing of the race rings. I10 resulting from the slight varia- W tions in size and/or spacing of the raceways L of similar race rings K is insufllcient to noticeably change the pressure imparted by the spring 208. After the race ring K is located in gauging position, the operator may turn this race ring on the balls I 88 to assure that the balls correctly seat against the raceways. The gauging mechanism is initially adjusted by turning the adjusting screw I88 to position the pointer I58 at a zero index on the dial I80 whenever the race ring K being gauged has raceways of standard size and standard spacing.

To avoid binding of the balls I 88 against the raceways L during mounting and demounting of the race ring K, both rows of balls I88 may be moved out of raceway engagement with the race rings I10 and radially inwardly towards similar conical race ring portions 2I8 which taper inwardly and towards each other. Stepped annular members 2", respectively secured to the retainers I12, extend axially out of the race ring K during gauging. Similar rings 2I8, detachably fastened to the annular members 2", loosely fit respectively about the supporting member I18 above the flange I82, and about the supporting member I88 below the flange I81, these rings being spaced from these flanges when the balls I88 are seated against the raceways as shown. When there is no race ring K in auging position, spaced springs 220 on the supporting member I88 yieldengagement with the flange I32 and the upper row of balls I 33 may move radially inwardly of the race rings and against the conical portion 2 it of the upper race ring I10. Hence, whenever the race ring K is removed from gauging position, the balls I33 may move inwardly out of contact with the raceways L, and when a race ring K is placed in gauging position, these balls are brought back into correct raceway engagement by the movement of the inner race rings l'lll towards each other.

The operation and electrical controls shown in Figure 1 will be described with respect to the matched grinding of a single row race ring R under control of the finished size of the companion single row race ring M. The same or similar electrical controls are operated in the same manner to regulate the size-grinding operation on each of the raceways of the double row race ring W under control of the measured sizes and spacing of the raceways in the companion double row race ring K.

A finished race ring, as M, is mounted on the remote control gauging mechanism It causing the indicator hand l2 to swing to a measuring position. The cone race ring R to be ground is mounted in grinding position, and the grinding machine is started with a coarse feed of the grinding wheel into the raceway S. The reed gauge stem I4 is lowered onto the raceway S. Motor terminals 230 and 23l of the synchronous motors 22 and 24 are connected to a power line 233, and motor terminals 234 and 235 are connected to a power line 236 through a contact A2 of a relay A and through contacts B-6 and 3-3 of a relay B. A main switch 238 is manually closed to connect the power lines 233 and 236 in circuit with power wires 240 through the normally closed push-button starting switch 13 and causing both motors 22 and 24 to simultaneously start rotating in synchronism and in the same direction to advance the contactors 2B and IS. A relay coil B-l' is thus energized from the power lines through a switch contact A4 of the relay A thereby lifting and holding a latch 242 out of latching engagement with a notch in the switch of relay B.

When the motor 22 swings the contactor 26 into engagement with the indicator hand l2, a relay coil A--l is energized and shifts the switching arms of the relay A to their dot-indicated positions. Contact A2 is then in open circuit causing both motors to stop with the contactor is located by the motor 24 in a position determined by the measuring position of the indicator hand l2. Contact A4 is then in open circuit position causing the relay coil Ei to de-enersize and drop the latch 242, and contact A3 is in closed circuit with the power lines to provide a. holding circuit through the relay coil Ai which remains energized and holds the switching arms of the relay A in their dot-indicated positions during the subsequent reversal of the motor 22 while the contactor 26 is being withdrawn from the indicator hand [2.

When the cone raceway S is reduced to an initial size determined by the preset position of the contactor I9, the contactor I'I engages the contactor I9 to close a circuit from the secondary of a transformer H through a solenoid 243 which now shifts a lever 244 from its full line position to its dot-indicated position for restricting the stroke of an oscillating carriage 245 to reduce the coarse grinding feed to a finish grinding feed. The oscillating carriage 245 pivotally supports a spring-pressed pawl 246 which imparts a fcedlns movement to a wheel 24! that forms a part of a grinding wheel feedin mechanism. When the raceway S has been further reduced to a size determined by the measuring position of the indicator hand I2, contactor it engages contactor I! which results in stopping the finish grinding feed and sparking out of the grinding wheel with this raceway ground to the required size. This engagement of the contactors l3 and I1 energizes a relay G from the secondary of the transformer H causing electrical connection between terminals G-i and (3-2 to energize the coil of a delay relay F from the power lines 233 and 233. After a short delay, which may be approximately one second, a normally closed switch F-I will be shifted to open circuit position by the energized coil of the relay F. The temporarily closed circuit made through the switch F-I causes current from the power lines to simultaneously energize the relay coils B2 and Cl which now shift the switching arms of re ays B and C to their dot-indicated positions. While the relay coil E2 is temporarily energized, the latch 242 drops into latched position to lock the switching arms of the relay B in engagement with contacts 3-! and 3-1 which are thus connected to energize a solenoid 250 that pulls the spring pressed pawl 246 from engagement with the feeding wheel 24! to stop the grindin wheel feed. The grinding wheel sparks out with the diameter of the cone raceway S in matching relation with the measured size of the cup raceway N.

While the relay coil Cl remains temporarily energized, current flows through contacts 0-2 and 0-3 to respectively energize relay coils D-i and El which then shift the switching arms of the reversing relays D and E from their normally open circuit to their dot-indicated closed circuit positions. Contacts D-3 and E3 of the relays D and E now respectively connect the motor terminals 248 and 249 with the power line 236 causing the motors 22 and 24 to start reversing and to withdraw the contactors 26 and I9 towards their starting positions, the contactor 26 disengaging from the indicator hand i2 and the retracting contactor 19 causing the contactor I! to first spring away from the contactor l8 followed by the retreat of the contactor [9 from the contactor ii. The disengagement of the contactor H from the contactor i3 deenergizes the relay G-which in turn deenergizes the coil of the relay F causing the switch F-I to again close. The deenergizing or the temporarily closed relay C does not cause the motor reversing relays D and E to shift back to open circuit positions since their switching arms which engage contacts D-2 and E2 are respectively in series connection with the normally closed motor operated switches 11 and I45, to provide holding circuits which maintain the relay coils D-l and E-i energized to hold the switching arms of the relays D and E in their closed circuit positions.

The pin I4, moved by the motor 22, opens the switch 11 at a predetermined position of this motor's reversal to deenergize the relay coil Dl resulting in the return of the switching arms of the relay D to their open circuit positions which causes the motor 22 to stop with the contactor 28 located at its predetermined starting position. Similarly the arm I43, moved by the motor 24, opens the switch I 45 to deenergize the relay E and stop the motor 24 with the contactor I! located at its predetermined starting position. The individual control of the stopping 13 positions of these motors during reversal prevents accumula'tive error of the resetting positions of the contactors 2i and I! in the'event that these motors might not stop uniformly.

The relay F could be eliminated in which event the connections to the switch F'i would be permanently joined and the relay coils 3-2 and Cl would remain energized as long as the contactors l1 and I! were in engagement. Normally, these contactors disengage in response to the withdrawal of the contactor II and prior to the opening 01 the switches I1 and I. However, the delay relay F is preferably included to insure that the contactors l1, l8 will be taken out of circuit at the start of the motor reversal amass switches 'II and I respectively stop these motorswith'e'ach oi the contactors :28 and II so that the resetting of the contactors 26 and I! will be controlled only by the opening of the switches 11 and I 45. Hence, a conceivable delayed disengagement oi' the contactors l1 and II cannot make the opening of the switches 11 and H5 ineflective by maintaining the relay C in closed circuit position which in turn would maintain the relay coils D--i and E-l energlzed and cause an incorrect resetting of the contactors 28 and i9. 7

When the grinding oi raceway S is completed, the gauge stern I4 is lifted. The finished cone racering R is replaced by another cone race ring to be ground, and the cup race ring M is replaced by the next cup race ring which is to the switchingv arms of the relay B back to their W full line positions. Current then flows through the contact A-2 and the contacts 3-. and B--8 to simultaneously start both motors rotating forwardly, andthe cycle oioperation continues as before.

From the foregoing it will be noted that the gauging mechanism l6, which responds to the size of the article B being ground for mating relation with the article M, has a member ill movable in accordance with the changing size of the raceway S; and gauging means Iii, which measures the article M, has the element i2 movable to a position determined by the size of the raceway N. Electrically operated mechanism, including the simultaneously moved motor driven contactors 26 and is that are adjustably preset, by the engagement of contactor 26 with the element l2, locates the adiustable member or contactor IS in a position to limit the movement of contactor l1 thereby predetermining the eucult controlling positions of the contactors l1, l8 and I! which act as switches for adjusting the 'operative'relations between the grinding controlling means 243-241 and the gauging mechanism it. When the contactor l1 engages the preset precisely located at its predetermined starting position.

We claim:

1. In apparatus for regulating the grinding to size of one oi a pair or articles 'under control of the. size of the other article. gauging mechanism responsive to the size 0! the article being ground,

grinding controlling means responsive to the gauging mechanism, and motor actuated mechanism controlled by the size or said other article for adjusting the position oi the gauging mechanism at which the grinding controlling means is actuated.

2. In apparatus for regulating the grinding to size of one of a pair of articles under control of the size oi the other article, a gauging mechanism for the article being ground and including a circuit controlling mechanism, feeding mechanism controlled by said circuit controlling mechanism for eiiecting a change in a grinding feed when said article reaches a desired size. gauging means for supporting and measuring the size of said other article, said-gauging means being supported independently oi the gauging mechanism, and'motor actuated apparatus controlled by said gauging means for adjusting the circuit controlling mechanism.

3. In apparatus for regulating the grinding to size of one of a pair of articles under control 01' the size of the other article, gauging mechanism responsive to the size of the article being ground, a pair of contactors relatively moved by the gauging mechanism to control a circuit when the article being ground is reduced to a desired size, and motor operated mechanism responsive to the size of said other article for adjusting the relative movement of said contactors.

4. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, gauging mechanism responsive to the size of the article being ground, a pair of contactors reiatively moved by the gauging mechanism to a close a circuit when said article is reduced to a trolling the circuit closing position of said con-.

tactors.

5. In apparatus for controlling the grinding to size of one of a pair of articles for mating relacontactor la, a change from rough to fine grinding feed is effected, and when'the contactor it subsequently engages the contactor ll now located by the preset contactor IS, a further change in feed is effected causing a stopping of this fine grinding feed and reversing both. of the synchronous motors 22, 24 so that the contactors 26 and I! will be retracted towards their starting positions. The reversal of these motors contion, a pair of contactors for establishing an electrical circuit, a member movable in accordance with the changing size of the article bein ground and producing a relative contactor movement into contacting engagement, means including an element movable to a Dosition determined by the size of said other article, and motor operated mechanism responsive to the position of said element for adjustably controlling the engaging position of said contactors.

6-. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of the article being ground, a pair of relatively movable contactors for establishing an electrical circuit and carried by said member, gauging means for said other article, an element for limiting the relative movement of said contactors, and electrically actuated mechanism controlled by the gauging means for-adjustably positioning said element.

'7. In apparatus for controlling the grinding to tinues until the individually adjusted motor -size of one ofa pair or articles'i'or matingre- Baugmg -acoaaaa lation, gauging mechanism responsive to the size 01' the article being ground and including a pair of contactors relatively moved to control a circuit whenthe article being ground is reduced, to a desired size, a movable element positioned in accordance with the size of said other article. and motor operated mechanism responsive to the position of said element for adjustably limiting the relative movement of said contactors.

8. In apparatus for controlling the grinding to size oi one of a pair of articles for mating relation, a pair of contactor-s for establishing an electrical circuit, a member movable in accordance with the changing size 01' the article being ground and producing a movement of one of the contactors with respect to the other to establish said circuit when said article is reduced to a desired size, measuring means responsive to the size 01' the other article, a motor, a motor operated mechanism for controlling the circuit establishing position of said contactors, means to start said motor, and switching mechanism controlled by said measuring means for stopping the motor.

9. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size oi the article being ground, measuring means forsaid other article, circuit controlling mechanism responsive to the position of the movable member for ed'ecting a change in grinding feed when the article being ground reaches a desired size, and electrical mechanism including a pair of synchronously operated motors controlled by said measuring means for ad- Justing the position at which the circuit controlling mechanism responds to said movable member.

10. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of the article being ground, circuit controlling mechanism responsive to the position of said movable member, a movable element positioned in accordance with the size of said other article, a pair 01' movable contactors, and means to simultaneously advance said contactors from preset positions, one of the contactors adjustably controlling the position at which the circuit controlling mechanism responds to the movable member, and the other contactor moving into circuit closing relation with the movable element to simultaneously stop the advance of both contactors. 11. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of the article being ground, switching mechanism operated by said movable member when the article being ground attains a desired size, a movable element positioned in accordance with the size of said other article, said switching mechanism including a contactor movable from a preset position towards the movable member to adJustably control the switch operating position of said movable member, a second contactor movable from a preset position into engagement with the movable element to stop the movement of both contactors, meansto simultaneously start both contactors moving, and means to return both contactors to their preset starting positions.

12. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the switch operating position of said movable.

member, the other contactor being advanced into engagement with the movable element for simultaneously stopping the advance of both contactors, and means to return both contactors to individually adjustable starting positions.

13. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of the article being ground, circuit controlling means responsive to said movable member when the article being ground attains a desired size, a movable element positioned in accordance with the size of said other article, a contactor movable from a preset position towards the movable member to adJustably control the position at which the circuit controlling means responds to said movable member, a second contactor movable from a preset position into engagement with the movable element for stopping the movement of both contactors, means to start both contactors moving simultaneously, mechanism responsive to the operation of the circuit controlling means for returning both contactors towards their preset positions, and mechanism for stopping the contactors at their preset positions.

14. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member-movable in accordance with the changing size oi the article being ground, switching mechanism operated by said member when the article being ground reaches a desired size, a movable element positioned in accordance with the size of said other article, a pair of synchronous motors, an adjustable member advanced by one of said motors to adjust the switch operating position of the movable member, a contactor advanced by the other motor into circuit closing relation with the movable element to stop both motors, and means to start both motors operating simultaneously from preset starting positions.

15. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of the article being ground,

switching mechanism operated by said member when the article being ground is reduced to a desired size, a movable element positioned in accordance with the size of said other article, a pair of synchronous motors, said switching mechanism including a contactor advanced through an adjustable extent by one of said motors to adjust the switch operating position of said movable member, a contactor advanced by the other motor into circuit closing relation with the movable element to stop both motors, means to start both motors simultaneously in a direction to advance the contactors, mechanism to reverse both motors, and individually adjustable mechanisms to stop the reversal of said motors for locating the contactors at predetermined starting positions.

16. In an apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance the changing size of the article being ground, with the changingsizeoi the article being ground,

17 switching mechanism operated by said member for efiecting a change in a grinding feed when the article being ground reaches a predetermined size, gauging means including a movable hand for indicating the size of said other article, a movable contactor; means for moving the contactor from a preset starting position into engagement with said hand to establish a circuit, mechanism controlled by the engagement of said contactor with said hand for controlling the switch operating position of the movable member, and means responsive to the switching mechanism for returning the contactor to its preset starting position.

17. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a member movable in accordance with the changing size of-the article being ground, circuit closing meansroperated by said movable member when the article being ground reaches a desired size, an indicator hand positioned in accordance with the size of said other article, said circuit closing means including a contactor movable from a preset position towards the movable member to adjustably control the position at which the circuit closing means is operated by said movable member, a second contactor movable from a preset starting position into engagement with the indicator hand to stop the movement of both contactors, means to start both contactors moving simultaneously towards their operative positions, mechanism controlled by said circuit closing means for eflecting a retracting movement of the contactors towards their starting positions, and adjustable means for individually controlling the preset starting position to which each contactor ls retracted.

18. In apparatus for controlling the grinding to size of one of a pair of articles for mating relation, a movable member positioned in accordance with the changing size of the article being ground, circuit controlling means operated by said member for closing a circuit when the article being ground is reduced to a desired size, a movable element positioned in accordance with the size of said other article, a pair of reversible synehronous motors, a contactor advanced through an adjustable extent by one of said motors to adjust the closing position of the circuit controlling means, a contactor advanced by the other the changing size of the'article being ground, circuit controlling means operated by said memher to close a circuit when the article being ground reaches a desired size, a movable element positioned in accordance with the size of said other article, a pair of synchronous motors. means to start both motors simultaneously, a contactor advanced through an adjustable extent from a preset starting position by one of the motors for controlling the closing position of the circuit controlling means, a contactor advanced from a preset starting position by the other motor into engagement with said movable element for stoppingboth motors, mechanism responsive to the closing of said circuit for reversing both motors to withdraw the contactors towards their starting positions, mechanism disconnecting control of the motor reversing means from the circuit controlling means while said motors continue to reverse, switches respectively operated by each motor to individually stop the motors when the contactors reach said preset starting positions, and means for adjusting the operative relation between said switches and motors.

20. In the grinding of an angular contact double row ball bearing, apparatus for controlling the grinding of each inner raceway to a size for mating relation with a corresponding outer raceway and comprising a movable element positioned in accordance with the aggregate difference from standard size and from standard spacing of the outer raceways, and mechanism responsive to the position of said movable element for controlling the size to which each of the inner raceways is ground.

21. In the grinding of' an angular contact double row ball bearing, apparatus for controlling successive grinding operations on each of a pair of inner raceways to a size for mating relation with corresponding outer raceways and comprising gauging means including an element able member positioned in accordance with the motor into engagement with said movable ele- V reduction in size of the raceway being ground grinding feed controlling means responsive to the position of said member, and mechanism responsive to the position of said movable element for adjusting the position at which the grinding feed controlling means responds to said movable member.

HENRY MICHELSEN. MERTON E. REID.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,893,205 Hughes Jan. 3,,1933

Certificate of Correction Jonuery 25, 1949. HENRY MICHELSEN ET AL. It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 2, line 39, after the word inner insert race; column 8, lines 19 and 21, for presen read preset; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 24th day of May, A. D. 1949..

Patent No. 2,460,232.

THOMAS F. MURPHY,

Am'mmt aommiuiomr of Patents. 

